_GNU_SOURCE is provided by lib.mk, so it should be dropped to prevent
redefinition warnings.

Signed-off-by: Edward Liaw <edliaw@google.com>
---
 tools/testing/selftests/splice/default_file_splice_read.c | 1 -
 tools/testing/selftests/splice/splice_read.c              | 1 -
 2 files changed, 2 deletions(-)

diff --git a/tools/testing/selftests/splice/default_file_splice_read.c b/tools/testing/selftests/splice/default_file_splice_read.c
index a3c6e5672e09..a46c5ffb573d 100644
--- a/tools/testing/selftests/splice/default_file_splice_read.c
+++ b/tools/testing/selftests/splice/default_file_splice_read.c
@@ -1,5 +1,4 @@
 // SPDX-License-Identifier: GPL-2.0
-#define _GNU_SOURCE
 #include <fcntl.h>
 
 int main(int argc, char **argv)
diff --git a/tools/testing/selftests/splice/splice_read.c b/tools/testing/selftests/splice/splice_read.c
index 46dae6a25cfb..418a03837938 100644
--- a/tools/testing/selftests/splice/splice_read.c
+++ b/tools/testing/selftests/splice/splice_read.c
@@ -1,5 +1,4 @@
 // SPDX-License-Identifier: GPL-2.0
-#define _GNU_SOURCE
 #include <errno.h>
 #include <fcntl.h>
 #include <limits.h>
-- 
2.45.0.118.g7fe29c98d7-goog